Teeeitoey



(No Model.)

J. F. SANDERS. GONGENTRATOR OR ORB SEPARATING APPARATUS. f

Patented Feb. 7,1882.

Vlfllzesses N. PETERS, Fhulljlhognpher, Washingon. DA C.

NTTED STATES PATENT Orifice..

JOHN F. SANDERS, OF OGDEN, UTAH TERRITORY.

CONCENTRATOR FOR ORE-SEPARATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 253,229, dated February7,1882.

Application filed June 28, 1881. (No model.)

To all whom it 'may concern:

Be it known that I, JOHN F. SANDERS, of Ogden, in the county of leberand Territory of Utah, have invented an Improved Concentlator forOre-SeparatingApparatus,of which the following is a specitieation.

This invention relates to the combination of' a vibrating or otherwiseagitated concentrator, which is divided into compartments bytransversely-placed ribs, with sieves placed over said compartments,which sieves permit the fine particles ot gold and other metals to passthrough them into said compartments and protect them against thecurrents of water and against the downward pressure ot' the coarsersands, &c. The ribs which divide the concentrator into compartmentsextend also above the sieves.

In the accompanying drawings, Figure l lrepresents an end view of myimproved concentr.ttor, showing it as suspended in suitable machineryfor operating'. Fig. 2 is a vertical longitudinal section oftheconcentrator.

The letter A represents the concentrator, which is a shallow pan, ofproper length and width, suspended by rods a, or otherwise, from thesupporting frame-work, and agitated by suitable eccentrics, (markedb,)which are shown by dotted lines in Fig. 1. This concentrator isplaced under a suitable supply-hopper, B, indicated in Figs. l and 2 bydotted lines, so as to receive at one end the supply of mixed sand andgold or sand and amalgam which it is de' partments may be of varyingdegrees of coarseness, so that the sieve receiving the rst charge maybethe finest, the next coarser in mesh, and soon.Itwillbereadilyperceivedthatthesieves allow the ner particles ofgold andthelike that are to be saved to drop into the compartment upon thebottom l below, whereas the coarser particles will remain on the sieveand by the shaking action of the concentrator be caused to pass overtheseparate ledge to the next sieve, excepting the coarse particles whosegravity will retain them on the first sieve. Thus I save in eachcompartment below the sieve the iinest particles of gold or othermaterial to be separated and on the sieve the coarser particles oftheheaviest material contained in the gravel. The bottom l has an openingto each compartment, closed by a gate. Were it not for these sieves thecurrents of water which are usually'employed on such concentrators toassist in moving gravel would be apt to carry the iinest particles ofgold oft", and, again, the tinest particles would be very apt, it' itwere not for the sieves, to be moved to the wrong place under the weightot' the heavier gravel that rests on top. By means of the sieves the neparticles are protected against the superincumbent gravel, and alsoagainst being swept away by the current ot' water.

I do not here claim the concentrator provided with transverse ribs, norone with a sieve-bottom alone; but

Vhat I do claim isln a concentrator, A, having transverse ribs d d,which divide it into compartments, the

sieves t' fi, placed above the receiving-bottom ZA ofthe concentratorand below the upper edges of the ribs, substantially as and for thepurpose described.

JOHN F. SANDERS.

Witnesses:

ABBoT R. HnYwooD, M. BUoHMrLLnR..

